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Dictionary Entry: 候风地动仪
Word
Pinyin
候风地动仪
hòu fēng dì dòng yí
the world's first seismograph invented by Zhang Heng 張衡|张衡[zhāng héng] in 132
Dictionary Card
Child Entries of 候风地动仪
动
风
地
地
候
仪
地动仪